ChemInform Abstract: Probes for Narcotic Receptor Mediated Phenomena. Part 19. Synthesis of (+)‐4‐((αR)‐α‐((2S,5R)‐4‐Allyl‐2,5‐dimethyl‐1‐piperazinyl)‐ 3‐methoxybenzyl)‐N,N‐diethylbenzamide (SNC 80): A Highly Selective, Nonpeptide δ Opioid Receptor Agonist.